Whenever VOIP and GPL'ed software are mentioned I always think of asterisk.  
It's safe to say that asterisk has a history that is as interesting and as long 
as that of GNU Radio :-).  (Another buzzword to keep an eye on in this area BTW 
is "ROIP").

Anyway asterisk (in addition to being the GPL swiss army knife for VOIP) has 
very highly articulated two-way radio and radio repeater module which is known 
as app_rpt - their project page ("The fusion of 2-way radio systems and VOIP") 
is at
    http://ohnosec.org/drupal/.  

While the focus of app_rpt historically has been on analog (NBFM) radios 
transmitting and receiving on discrete frequencies, our project (op25) offers a 
plugin channel driver to extend a bridge between the asterisk/app_rpt/VOIP 
world and GNU Radio.   When using the USRP hardware it aims to support a fully 
generic, multi-channel, FDX two-way radio infrastructure with a specific focus 
on P25.  We're always looking for experimenters and amateurs who are interested 
in these technologies...  Project pages are
    http://op25.osmocom.org/trac/wiki
    http://op25.osmocom.org/trac/wiki.png/wiki/RepeaterPage

Lots of work still to do (of course), including all the new goodies Jonathan 
Corgan has been mentioning that are in the GR pipeline for dealing with 
packet-oriented datacomm protocols...


Best Regards

Max
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